Joycon Ex and Ford/Microsoft Sync Steering Wheel Controls

I'm using a Joycon Ex to monitor the steering wheel control buttons in my 2009 F150. I've successfully incorporated the radio controls, but the sync-specific buttons (phone, voice, etc) don't use the same wires. I'm assuming these are located in the wiring harness that plugs into the back of the sync unit. Does anyone know what wires in the sync harness map to the steering wheel controls? Alternatively, any tricks for identifying the wire or wires I need to tie into the Joycon? Last thing I need to finish, before buttoning her back up, so I'd greatly appreciate it.